Improvement in preserve-jars



1.A M. wHlTALL Fruit Jar.

No.- 32,594.` Patented 1an.;18, 1861.

UNITED STATES PATENT OFFICE.

.IoHN IvI. wHITALL, or PHILADELPHIA, PENNSYLVANIA.

IMPROVEMENT IN -PRESERVE-JARS.

Specification forming part of Letters Patent No. 32,594, dated June 1S, 1861.

To all whom it may concern.-

Be it known that I, JOHN IVLWHITALL, of the city and county of Philadelphia, and State of Pennsylvania, have invented certain new and useful Improvements. in PreserveJars; and I do hereby declare that the same are described and represented in thefollowing speciication and accompanying drawings.

The nature of my improvements in preservejars consists in arranging the packing in a groove around the mouth of the jar, and beveling the under side of the cover, so that it will press Iirst and hardest on the inside 4corner of the packing-ring, in` such' a way and manner t-hat after the jar is lled and closed, as the contents of the jar shrinks in'cooling, the pressure of the air on the outside of the packing will press it (the packing) into the joint between the cover and jar and secure a tightjoint.

To enable others skilled in the art to make and use my improvements, I will proceed to describe their construction and the mode of using them, referring to the drawings above mentioned, in which the same letters of reference indicate like parts in each of the figures.

Figure I is an'elevation of the jar with my improvements. Fig. 2 is a sectional elevation of the jar, cut perpeudicularly through the center.

In these drawings, A is the jar, made cylindrical, of glass, with a bottom, B, and top C. This jar is reduced at D, forming a neck, and the upper edge of the jar is spread and `made thicker around the mouth E, as shown in the drawings; and there is a groove, F, in the upper edge, around the mouth of the jar, for the packingiring G, made of india-rubber, which ring of packing is made so thick or deep as to project about one-eighth of an inch above the top of the jar before the cover is applied. The top ofthe cover C is made convex, as shown in the drawings, with a projection, H, in the center. The under side ofthe cover is provided with a rim, I, to enter the `mouth of the jar and hold lthe cover in its proper position on the jar. rIhe under side of the cover C, from the rim I to the edge, is beveled upward, as shown at .I in Fig. 2 of the drawings, so as to press iirst and hardest on the inside edge of the packing-ring when the cover is applied to the jar, and make an air-tight joint with a moderate pressure on the cover. After the applied, as shown in the drawings, to hold the cover on.

In using this jar, heat the cover and jar before putting in the hot fruit. the hot fruit to within one-half or three-fourths of an inch of the top, and apply the cover and press it down, and put on the bent'wire,which will hold it fast. Vhen the contents of the vjar cools and shrinks, so as to form a vacuum `or partial vacuum, the pressure of the air presses the ringof packing into the joint between the jar 'and cover, 'holding it irm and tight. groove, is protected from injury.

I am aware that it is not new to make a groove around the mouth of a jar, nor to secure the cover with a bent wire or hasp, and also that a packing-ring of india-rubber has been used between the cover and the jar; but I believe it is new to bevel the under side of the LWIsTAE EvANs.

cover is applied the bent wire or hasp K is Then Iill it with forces down the cover, and at the same time The packing-ring, being placed in a 

